On Sat, 5 May 2012, Ben Skeggs wrote: > On Saturday, 5 May 2012, Mark Hills wrote: > > > On Sat, 5 May 2012, Maarten Maathuis wrote: > > > > > On Fri, May 4, 2012 at 5:55 PM, Mark Hills <[email protected]> wrote: > > > > I have a Dell 2007FP monitor. NV43 (GeForce 6600) can not use the native > > > > resolution. > > > > > > > > 1600x1200 is listed under "DDC gathered Modelines" with the rest of the > > > > info, but then is missing from "probed modes". > > > > > > > > I have a secondary card, NV4a (GeForce 6200, PCI). It works with this > > > > card. This card does not show "DDC gathered modelines" at all, and > > > > 1600x1200 is listed under "probed modes". > > > > > > > > Does this mean the NV4a card is not using the DDC info? Is it a bug > > > > preventing 1600x1200 being used with the NV43, or some consequence of > > > > DDC > > > > info? > > > > > > > > I am using Nouveau from Git, and kernel 3.4.0-rc4. The proprietary > > > > NVidia > > > > driver fully works, as does another 1600x1200 monitor (Lacie). [...] > > > Hi, the nouveau driver contains a table that list per gpu generation > > > the maximum bandwidth a single tmds link can sustain. > > > > > > Your NV4A is newer than your NV43, it can do the full 165 MHz, instead > > > of the 155 MHz that the NV43 gets. Your 1600x1200 mode requires 162 > > > MHz.
I compared to the proprietary driver and, if I understand correctly, the maximum bandwidth of the secondary card is now different. Is this something to be concerned about? [ 3593.751] (II) NVIDIA(GPU-1): NVIDIA GPU GeForce 6200 (NV44) at PCI:3:2:0 (GPU-1) [ 3593.751] (--) NVIDIA(GPU-1): DFP-0: 155.0 MHz maximum pixel clock [ 3593.751] (--) NVIDIA(GPU-1): DFP-0: Internal Single Link TMDS For comparison, here is quotes from the Nouveau log: [ 5962.553] (--) NOUVEAU(0): Chipset: "NVIDIA NV4a" [ 5962.682] (II) NOUVEAU(0): Supported detailed timing: [ 5962.682] (II) NOUVEAU(0): clock: 162.0 MHz Image Size: 367 x 275 mm [ 5962.682] (II) NOUVEAU(0): h_active: 1600 h_sync: 1664 h_sync_end 1856 h_blank_end 2160 h_border: 0 [ 5962.683] (II) NOUVEAU(0): v_active: 1200 v_sync: 1201 v_sync_end 1204 v_blanking: 1250 v_border: 0 [ 5962.683] (II) NOUVEAU(0): Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 83 kHz, PixClock max 175 MHz > > > I do not know if the limits are accurate, but a reduced blanking > > > 1600x1200 should use less bandwith, so if you somehow can get such a > > > mode into the system (maybe there is a kernel option to do this), but > > > this i do not know. > > > > Thanks, I see what you're saying. I think the relevant code looks to be > > get_tmds_link_bandwidth. > > > > But then if the mode given by the DDC is over this limit, I don't > > understand why the proprietary drivers do not have the same problem. > > > > Does it mean that the prietary driver is falling-back to one of its own > > built-in 1600x1200 modes? > > > I've looked at this issue previously, and IIRC the binary driver builds a > reduced blanking mode instead of what the monitor reports. For comparison, here's extracts from the proprietary driver's Xorg.0.log output from the primary card (NV43), where the Dell screen works correctly: [ 3593.426] (II) NVIDIA(0): NVIDIA GPU GeForce 6600 (NV43) at PCI:1:0:0 (GPU-0) [...] [ 3593.427] (--) NVIDIA(0): DELL 2007FP (DFP-0): 155.0 MHz maximum pixel clock [ 3593.427] (--) NVIDIA(0): DELL 2007FP (DFP-0): Internal Single Link TMDS [ 3593.427] (--) NVIDIA(0): DFP-1: 155.0 MHz maximum pixel clock [ 3593.427] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS [ 3593.427] (**) NVIDIA(0): Using HorizSync/VertRefresh ranges from the EDID for display [ 3593.427] (**) NVIDIA(0): device DELL 2007FP (DFP-0) (Using EDID frequencies has [ 3593.427] (**) NVIDIA(0): been enabled on all display devices.) [ 3593.427] (II) NVIDIA(0): Validated modes: [ 3593.427] (II) NVIDIA(0): "DFP-0:1600x1200" [ 3593.427] (II) NVIDIA(0): Virtual screen size determined to be 1600 x 1200 To use a valid 1600x1200 mode with Nouveau, it is a matter of adding an equivalent mode to an existing table somewhere? Or does KMS only allow the DDC modes to be used (requiring more extensive modification?) > > The same NV43 with Nouveau is happy with the 1920x1200 of another Dell > > screen, and the 1600x1200 of the Lacie. These modes are: > > > > [ 13816.407] (II) NOUVEAU(0): Modeline "1920x1200"x0.0 154.00 1920 1968 > > 2000 2080 1200 1203 1209 1235 +hsync -vsync (74.0 kHz) > > [ 13816.428] (II) NOUVEAU(1): Modeline "1600x1200"x0.0 130.89 1600 1620 > > 1700 1780 1200 1201 1204 1225 +hsync +vsync (73.5 kHz) > > > > Maybe I can find time to revert the kernel and try and NVidia drivers, to > > check the Xorg.0.log file. > > > > Thanks for your help. > > > > -- > > Mark > Thanks for your replies. -- Mark _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
